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Table 1 Baseline characteristics of the AS patients with hip involvement undergoing THA

From: Factors associated with blood loss in ankylosing spondylitis patients with hip involvement undergoing primary total hip arthroplasty: a cross-sectional retrospective study of 243 patients

Baseline characteristic Valuesa Rangeb
Clinical characteristics
 Age (years) 32 19 to 67
 Male (n, %) 218 (89.7%)  
 BMI (kg/m2) 22.64 11.87 to 37.11
 Disease duration (years) 11 0.5 to 40.3
 Hospital stay (days) 11 6 to 46
 Smoking history (n, %) 38 (15.6%)  
 Bilateral THA (n, %) 163 (67.1%)  
 Hip ROM = 0°(n, %) 121 (49.8%)  
 BASRI-hip (number of cases at involved hip)   
  3 (n, %) 178 (43.8%)  
  4 (n, %) 228 (56.2%)  
Preoperative laboratory values
 Elevated ESR level (> 15 mm/h for male and > 20 mm/h for female, n, %) 132 (54.3%) 1 to 99
 Elevated CRP level (> 1 mg/dL, n, %) 165 (67.9%) 0.1 to 11.6
 TT (s) 16.1 ± 1.0 12.3 to 19.4
 APTT (s) 40.4 ± 4.9 30.3 to 54.0
 PT (s) 13.5 ± 0.8 11.4 to 16.2
 PT (%) 94.4 ± 12.0 63.6 to 123.0
 INR 1.05 ± 0.08 0.88 to 1.30
 Fibrinogen level (g/L) 4.23 1.76 to 13.10
 Platelet level (× 109/L) 273 ± 72 103 to 509
 Hb level (g/L) 133 ± 16 90 to 171
 Hct (L/L) 0.404 ± 0.043 0.284 to 0.512
Perioperative data
 Periprosthetic fracture (n, %) 10 (4.1%)  
 Iliopsoas and adductor release (n, %) 41 (16.9%)  
 Administration of TXA (n, %) 159 (65.4%)  
 Chemoprophylaxis of thrombosis (n, %) 183 (75.3%)  
 Autologous transfusion (n, %) 66 (27.2%)  
  Unilateral THA (n = 80) 11 (13.8%)  
  Bilateral THA (n = 163) 53 (32.5%)  
 Allogenic transfusion (n, %) 229 (94.2%)  
  Unilateral THA (n = 80) 67 (83.8%)  
  Bilateral THA (n = 163) 162 (99.4%)  
 Operating time (min) 180 55 to 455
  Unilateral THA 90 55 to 285
  Bilateral THA 205 70 to 455
 CBL (mL) 1223 ± 542 162 to 3098
  Unilateral THA 790 ± 342 162 to 1901
  Bilateral THA 1435 ± 495 453 to 3098
  1. AS ankylosing spondylitis, THA total hip arthroplasty, BMI body mass index, ROM range of motion, BASRI-hip Bath Ankylosing Spondylitis Radiology Hip Index, ESR erythrocyte sedimentation rate, CRP C-reactive protein, TT thromboplastin time, APTT activated partial thromboplastin time, PT prothrombin time, PT% prothrombin activity, INR international normalized ratio, Hb hemoglobin, Hct hematocrit, TXA tranexamic acid, BV blood volume, CBL calculated blood loss
  2. aMean ± SD or median
  3. bMinimum to maximum